i really like the shapes of this guy! you developed a good sense for little details! its always good to have a nice contrast of big shapes and crisp details. the design of his left arm really fits the whole body! the right arm holding the sword kinda is TOO boring then again. maybe it should match the nice buldgy left arm as well? the mechs legs seem to be a bit short. its not a big deal but then again you may want to add a reason why you made them that short otherwise it just looks like a design flow. for example: no one would question the short legs of a gorilla like mech! a tiny bit of justification in terms of design should solve that issue